# Posts by SARA

Total # Posts: 4,580

math for liberal arts
construct a truth table to determine whether each argument is valid. Be sure to state whether it is valid or invalid with each question. 1) ~p v q p ____ triangle of dots p^~q

Are there any angles x and y that satisfy sin(x+y)= sinx+siny? Use an example to explain your answer.

Determine an expression using trigonometric ratios of special angles that simplifies to an answer of sqrt3/2. Use three different angles.

x and y represent two angles in standard position. x has its terminal arm in the first quadrant and y has its terminal arm in the third quadrant. If cosx=5/13 and cosy = -5/13 then find the value of 2sinx+2siny+2cosx-2tanx+tany+2cosy

physics
What are the decibels 917m away from a 35.5 W sound source?

art
what type of lines do you see in the art piece Kerry James Marshall 1994?

Functions
4cos2x - cosx-3 =0 0 to 2pi

Hi the problem reads.......give an example that shows how to use.the distributive property to multiply a number by a sum. All of the numbers you use should be mixed numbers or fractions.........PLEASE HELP!

math
The world population in 1992 is 5.42 billion. If its population doubled every 41 years, what would its population be in 41 years? 41 years, what would its population be in 82 years? 82 years, what would its population be in 164 years?

In the space before each of the following items, place a C if the capitalization is correct, a zero (0) if it is incorrect. Then insert capitals where they should be, and draw a line through capitals that should be small letters. 1. the Rocky Mountains 2. my spanish course 3. ...

physics
a heat engine operates between 403 K and 1263 K at 67% of Carnot efficiency. How much work can it produce from 5900J of input heat?

Calculus-Aproximate Areas
A ball is thrown upward at time t = 9 seconds on planet Ubuntu, and its acceleration from time t=9 seconds to t=21 seconds is given by the function . a(t) = (3) / (t - 8) m/s^2 Use 4 time intervals of equal length to overestimate, and then underestimate, the relative velocity ...

econ
Market demand facing a monopolist is Qd=-5P+20. If the monopoly practices perfect price discrimination, what is the profit-maximizing level of output when MC=\$2?

Calculus-concavity and graphing
(2x+1)/(8x+1) f is increasing for x: f is decreasing for x: find local max/min:

Calculus-Applied Optimization Problem:
Find the point on the line 6x + 3y-3 =0 which is closest to the point (3,1). Note: Your answer should be a point in the xy-plane, and as such will be of the form (x-coordinate,y-coordinate)

chemistry
calculate the molar mass of a liquid if .955grams of its vapors occupy 2.50Liters at 200 Celsius and 45 torr

chemistry
God bless you all :) <3 :)

Calculus Homework
Find the largest region over which the function f is increasing or decreasing, for: f(x):(x-4)/(x+8) f is increasing for x=

Calculus-Mean Value Theorem
Find the function G(x) whose graph passes through (pi/38,-12)and has f(x) as its derivative: G(x)= I already found which is: F(x)=76(1/-19)cos(19x)+C

Practice Exam Calculus
f(x) = 6sqrt{x}- 9x n the interval [1,9]. f(c)=f(9)-f(1)/9-(1)=? Verify that the conclusion of the Mean Value Theorem holds by computing Now find,c in (1, 9) so that f'(c) equals the answer you just found. c=?

Math
378 squared feet - it could be wrong so i suggest you try working it out with someone besides me first.

physics
1.what is the final velocity of a hoop that rolls with out slipping down a 3.00m high hill starting at rest? 2. a 1.80 m radius playground merry go round (disk = 1/2 m r^2) hass a mass of 120 kg and is rotating with an angular velocity of .600 rev/s. what is the angular ...

chem 1211
P2 +3H2=2ph3 How many grams of ph3 can be formed when 37.5 grams of p2 and 83 L of h2 gas are reacted at 1 atm and 273.25 K? I really need a step by step of this problem. Thanks in advance!

Chemistry
Choose from the list the correct electron configurations for the following ions. A B C D E F G H I J K+ A B C D E F G H I J In+ A B C D E F G H I J Li+ A B C D E F G H I J Na+ A. 1s22s22p63s23p6 B. 1s22s22p63s23p64s23d104p64d105s25p1 C. 1s22s22p63s23p63d104s2 D. ...

mathematics
exmples of logarithms

a 25gram bullet is fired upward through a .36kg block. the block goes up 17cm in the air and the bullet goes up 24m into the air. What is the initial velocity of the bullet?

physics
a .025kg bullet is fired upward through a .36kg block. the block goes .17meters and the bullet goes up 24 m in the air. what is the initial velocity of the bullet?

Chemistry
During your experiment, you are drive water from the hydrate M x X y ⋅zH 2 O . You subsequently determine that your hydrate has four molecules of waters associated with each formula unit. However, the bottle the hydrate came from indicated a formula with only six ...

maths
A little late but here is the answer: You know that the rate of change of the volume is dV/dt = 2 (given in the question). You also know that V = x^3 + 25x To find the rate of change of the depth of the liquid, we find dx/dt = dx/dV x dV/dt dV/dx = 3x^2 + 25, so dx/dV is 1 ...

Eng. Comp III
I'm not sure what I am supposed to do here I am to write a Bibliographic essay on my sources for my final research essay - what does this entail? I don't want you to do my homework for me,just give me a couple of examples please, Thank You, Sara

health HELP
4. Which of theses provides the most Vitamin A? Vitamin B, Vitamin C, Vitamin D, Vitamin E, Vitamin K? Cheeseburger French fries, 10 strips Oatmeal cookie Cup of apple juice Cup of chocolate milk

health HELP
Which of theses items provide the most zinc? Cheeseburger French fries, 10 strips Oatmeal cookie Cup of apple juice Cup of chocolate milk

math
write each addiction vertically. decide which new groups you will make. then add to see if you were correct. 256+1.273 A new ten? A new hundred? A new thousand?

music (Anyone)
who knows 2 same pieces of music but have different performers?

Math
5x3=15 74+15=89

physics
A shopper in a supermarket pushes a loaded cart with a horizontal force of 12 N. The cart has a mass of 33 kg. (a) How far will it move in 7.0 s, starting from rest? (Ignore friction.) m (b) How far will it move in 7.0 s if the shopper places her 30 N child in the cart before ...

Math
5th grade parent can you please show me how to break down 4 4/5 does it end up being 24/5? the probleam is: 4/4/5 -1 7/8

math
Thank you Jai!

math
5th grade math parent. This will sound dumb but.... 5/7 1/2 and 3/14. The sum is 1 3/7 correct? The question reads MArshall surveyed his classmates and found 5/7 have a sister, 1/2 have a brother, and 3/14 do not have siblings. The question is: Why does it make sense for the ...

math
5th grade math parent. This will sound dumb but.... 5/7 1/2 and 3/14. The sum is 1 3/7 correct? The question reads MArshall surveyed his classmates and found 5/7 have a sister, 1/2 have a brother, and 3/14 do not have siblings. The question is: Why does it make sense for the ...

Physics
A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car

Physics
A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car

Physics
A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car

Physics
A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car

Physics
A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car

Physics
A car traveling at a constant speed of 33.4 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 3.28 m/s2 How long after the trooper starts the chase does he overtake the speeding car

Physics
a car travels at 25m/s on a flat stretch of road. The driver must maintaint he pressure on the accelerator to keep the care moving at this speed. What is the net work done on the car over a distance of 250m?

Physics
a car travels at 25m/s on a flat stretch of road. The driver must maintaint he pressure on the accelerator to keep the care moving at this speed. What is the net work done on the car over a distance of 250m?

English

English
Okay...

English
What does stilted mean?

English
I think that "and" shouldn't be added after fish.

English
How would you evaluate this writing piece in terms of writing, grammar, style and content?

English
Thankyou so much Writeacher! Please let me know if you see any other spelling or grammar errors.

English
This sentence needs to be paraphrased: This environmental concern should be addressed through legislative (law) changes, and enforcement to the Species at Risk Act, and the Environmental Protection and Clean Water Acts. There is alot of "and" used here.

English
Was there any spelling or grammar mistakes in this writing piece?

English
I think "concern" is word that is also all over the place.

English
I'm done working on my first post. Let's work on this post please?

English
Alright, please check my other post to see my responses :)

English
Please track the errors by editing this passage of writing. This is an exercise for my English homework. I have made a couple of changes or editing to the writing piece already, but I am not sure if there are more editing that needs to be made. Also, please evaluate the ...

English

English
I am not sure either. I haven't written this piece. It was an exercise for my homework assignment.

English
Thankyou Writeacher :) I don't know #4 either. Would this work?: Toxicity assessment of oil sands use process affected water for fish cell lines.

English
Thanks Anonymous! I need help with paraphrasing this sentence: Toxicity assessment of oil sands process-affected (process affected) water using fish cell lines.

English
- Yes, Take oil out of the sands is much more smoother. - AB means Alberta. - This phrase seems akward to me: Natives get sick from eating to (too) many fish from mercury and air pollution is another big problem.

English
I need help with editing these sentence structures shown below, which is used in this writing piece. For example, can we break it into two sentences. This way it would make or sense. 1). Natives get sick from eating to (too) many fish from mercury and air pollution is another ...

English
Please track the errors by editing this passage of writing. This is an exercise for my English homework. I have made a couple of changes or editing to the writing piece already, but I am not sure if there are more editing that needs to be made. Also, please evaluate the ...

Chemistry
What volume of 0.01 M NaOH should be required to raise the pH of a litre of 25 mM H2SO4 to 4.0? I started out by attempting to find the initial pH of H2SO4 and determined I need 2.57 units of pH to raise it to 4. I know that somewhere I use the HH equation, but don't know ...

College Physics 1
A space probe has two engines. Each generates the same amount of force when fired, and the directions of these forces can be independently adjusted. When the engines are fired simultaneously and each applies its force in the same direction, the probe, starting from rest, takes...

pre calcalus
(x+4)^2/3=9

math
i didn't get how 16x^2 turned into 8x^2 16x^2 = 30x + 4 Solving for x, 8x^2 - 15x - 2 = 0

simple math
If a= 9990.9 and b= 9886.1. First, convert these to scientific notation. If only three significant digits are allowed in decimal portion (mantisa) of the scientific notation and chopping and not rounding is used, what is a-b?

Sociology
I need to break a folkway and write an essay on it - any ideas?

American Gov
What is the primary claim made by those who oppose hate crimes legislation?

Geography
thank you Ms.sue

Math
144

Math
if Kenneth has 22 problems of math to do for homework and had already done 12 problems done he would have to subtract 22-12=10 and then multiply 22 divide12 =10

physics
A car accelerates from 44 m/s to 52 m/s in 3.4 seconds. What distance is covered?

Maths
A ramp was built to move equipments into a shed. The ramp rises one foot. If the lower edge of the ramp is 8 feet from the base of the shed what is the approximate length in feet of the ramp Can someone please help me with this question

Sociology
Diane Kendall,9th edition, the question for assignment 1 is the review the top 10 values listed in textbook and decide which values are missing from the list and why were they not listed.

Pre Calculus 2
A ship regularly travels between two ports that are 350 miles apart. When traveling directly from A to B, the ship sails on a bearing of . However, to avoid a storm, one day the ship leaves A on a bearing of and travels for 6 hours at 17mph. When the bad weather has passed, it...

Calculus!!
Using the identity: L{f(t)/t}=integral F(p)dp (s -->infinity), find the integral of: sin(t)/t dt (0-->infinity)

Ehglish
How would you analyze an audience for the topic: Should regulations for home schools be changed?

Calculus HELP!
Use the fact that L{f'}=sF-f(0) to derive the formula for L{cosh at}

Chemistry
Okay, cool. So, the oxidation state of Co is 2+. Co2+ = [Ar]4s2 3d7 Metal cations get rid of the s orbital before the d, so can I say then the number of unpaired electrons is 7?

Chemistry
The complex [Co(ox)3]4- has a high-spin electron configuration. How many unpaired electrons are there in the complex? I know because it's a high-spin, it's tetrahydral shaped. But I don't know what (ox) is so, I'm stuck in finding the oxidation state of Co ...

Calculus
Find the Laplace transform of: f(t)=t-2e^(3t)

Chemistry
CoCl2<->CO+Cl2 Keq=7.6*10^-4 M CoCl2 is introduced in a closed container until its concentration is .890 M. What will be the concentration of Cl2 once the reaction has reached equilibrium?

Chemistry
How many liters of Cl2 has at a pressure of .950 atm and a temperature of 298K will be collected from the reaction of 25 mL of a .100 M aqueous solution of KMnO4 and an excess of HCI? KMnO4+HCI->MnCl2+Cl2+H2)+KCl

Chemistry
An aqueous solutions is 18.7% by mass Na3PO4. What is the boiling point of this solution? The Kb for water is .512 C/m. Consider if the solute is an electrolyte or a nonelectrolyte.

Chemistry
When the following reaction took place at 23.8 and a pressure of 758 torr, 3.9 L of o2 were collected. What mass of KCIO3 decomposed? KCIO3->KCI+O2

Chemistry
A mixture containing 5 g of H2 and 10 g of o2 is allowed to react in a 15 L rigid container at a constant temperature of 25 C. H2+O2->H2O Once the reaction is complete, what will be the pressure of the excess gas inside the container?

Chemistry
A sample of oxygen is collected over water at 22 C and 762 torr. What is the partial pressure of the dry oxygen? The vapor pressure of water at 22C is 19.8 torr.

Chemistry
A gas mixture containing N2 and O2 was kept inside a 2 L container at a temperature of 23 C and a total pressure of 1 atm. The partial pressure of oxygen was .722 atm. How many grams of nitrogen were present in the gas mixture?

Chemistry
A sample of oxygen is collected over water at 22 C and 762 torr. What is the partial pressure of the dry oxygen? The vapor pressure of water at 22C is 19.8 torr

Chemistry
Calculate the percent yield for the reaction if 76.8 g of H2O reacted and 125 g of NO were produced. NO2+H2O->HNO3+NO

Chemistry
Calculate how much acetylene (C2H2) can be produced from 358 g of H20 and an excess of CaC2 if the perfect yield for this reaction is 94.5% CaC2+H2)-> C2H2+C2H2+CA(OH)2

Chemistry
Calculate the number of moles of excess reactant that will be left-over when .350 g if HCN react with .500 g of 02: HCN+O2->N2+CO2+H20

Solution Set
The Y-coordinate of the solution of the system {x+y=3 {-3x+2y=-19 the answer is -2 how? I've done everything to try to solve!

Calculus
Find the complete solution to the 2nd ODE: 2y''+3y'+y=t^(2)+3sin(t)